EP0022585A1 - Bypass control device for turbo-supercharged internal-combustion engines - Google Patents

Bypass control device for turbo-supercharged internal-combustion engines Download PDF

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Publication number
EP0022585A1
EP0022585A1 EP80200488A EP80200488A EP0022585A1 EP 0022585 A1 EP0022585 A1 EP 0022585A1 EP 80200488 A EP80200488 A EP 80200488A EP 80200488 A EP80200488 A EP 80200488A EP 0022585 A1 EP0022585 A1 EP 0022585A1
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EP
European Patent Office
Prior art keywords
bypass
line
valve
control device
bypass control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80200488A
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German (de)
French (fr)
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EP0022585B1 (en
Inventor
Bruno Dipl.-Ing. Zumstein
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Publication of EP0022585A1 publication Critical patent/EP0022585A1/en
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Publication of EP0022585B1 publication Critical patent/EP0022585B1/en
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a bypass control device for turbocharged internal combustion engines according to the preamble of the claim.
  • bypass devices are known to improve the part-load behavior of turbocharged internal combustion engines.
  • a portion of the compressed charge air which is dependent on the respective operating state of the engine is returned via a bypass line to a location of the exhaust line located in front of the exhaust gas turbine.
  • the bypass device has a bypass valve which can be controlled as a reference variable by means of a variable dependent on the engine load. The valve is raised in such a way that a large amount of air flows in the idling and lower part-load range and, with increasing load, an ever decreasing amount of air until the valve closes completely at full load and the overflow of bypass air is prevented.
  • the control variable for controlling the bypass air flow uses the pressure difference prevailing over the bypass between the compressed charge air and the exhaust at the turbine inlet.
  • the invention defined in the characterizing part of patent claim 1 arose from the task of creating a bypass control device in which the engine speed is used as a command variable.
  • the reason for this was the use of this device, which is preferably planned for vehicle engines, for which the engine speed is particularly well suited as a reference variable.
  • the six-cylinder turbocharger engine 1 shown schematically in FIG. 1 has an exhaust manifold 2 and a charge air receiver 3.
  • the exhaust gases enter and leave the exhaust gas turbine 6 of the turbocharger 5 via an exhaust pipe 4 through an exhaust pipe 8.
  • the exhaust gas turbine 6 is connected by a shaft 7 to the compressor 9, which sucks in air through an intake line 10 and compresses it via a charge air line 11 through the bypass control housing 12 into a charge air cooler 13 and further into the charge air receiver 3 where the cylinders get their combustion air.
  • the bypass line 14 connects the bypass control housing 12 to a point of the exhaust pipe before entering the turbine 6.
  • the bypass device also includes an electric speed sensor which can be driven by the flywheel 15 and an amplifier 16 which supplies current for indicating the speed and for actuating a proportional magnet, as well as a signal line 17 between the speed sensor 16 and the control housing 12.
  • the bypass control device is shown schematically in FIG. 2.
  • the control housing 12 is connected to the charge air line 11 via a valve opening 18 and to the exhaust pipe 4 via the bypass line 14.
  • the bypass valve 19 cooperating with the valve opening 18 is designed as a poppet valve which has at the upper end of its valve stem a piston 22 which is displaceable in an actuating cylinder 20 and is loaded by a compression spring 21.
  • the device uses a fluid under approximately constant pressure, e.g. Air from a compressed air network, oil from a hydraulic unit or from the engine's lubricating oil circuit.
  • a fluid under approximately constant pressure e.g. Air from a compressed air network
  • oil from a hydraulic unit or from the engine's lubricating oil circuit The supply line and the discharge line of the working medium are designated 23 and 24 in the two figures.
  • a throttle valve 25 which can be fixed for a specific engine and which limits the maximum mass flow of the working medium through the valve, as well as a control throttle valve 26 which, depending on the speed, controls the flow cross section through its seat and thus the working medium pressure between controls the two throttles 25 and thus over the piston 22 of the actuating cylinder 20.
  • the pressure in the actuating cylinder 20 required for a given motor and thus the actuating forces for actuating the bypass valve 19 can be adjusted by appropriate adjustment of the throttle valve 25.
  • the speed-dependent actuation of the control throttle valve 26 is carried out by the proportional magnet 27, the armature rigidly connected to the valve 26 with increasing strength of the signal transmitted through the signal line 17 from the signal generator 16 against the resistance of a compression spring 28 is pulled further into the stator until it is close the maximum output speed of the engine completely closes the throttle cross-section.
  • the actuating force on the piston 22 is thus at a maximum, and thus the bypass valve 19 is completely closed, and the overflow of compressed charge air is completely prevented.
  • the output signal generated by the signal generator 16 is converted by the amplifier into a speed-proportional voltage, which is converted by the proportional magnet 27 into the desired speed-dependent adjustment of the control throttle valve 26 and the bypass valve 19 and thus the bypass flow.
  • the signal transmitter amplifier can be expanded with an element that ensures that the bypass valve remains closed in the lowest speed range.
  • a microprocessor could also be integrated into the control, with which any valve lift curve that is clearly dependent on the engine speed can be implemented.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

Bypaßsteuereinrichtung für ein Bypaßventil (19) in einer Bypaßleitung (14), die eine stromabwärts des Verdichters liegende Stelle der Ladeluftleitung (11) mit einer vor dem Turbineneintritt befindlichen Stelle der Abgasleitung verbindet, mit einem Betätigungszylinder (20) für das Bypaßventil (19), wobei der Druck eines Fluids im Betätigungszylinder (20) durch eine feste Drossel (25) in der Fluidzuleitung (23) und eine durch elektromagnetische Mittel (27) proportional zur Motordrehzahl verstellbare Drossel (26) in der Fluidableitung (24) gesteuert wird.Bypass control device for a bypass valve (19) in a bypass line (14), which connects a point of the charge air line (11) located downstream of the compressor to a point of the exhaust line located before the turbine inlet, with an actuating cylinder (20) for the bypass valve (19), wherein the pressure of a fluid in the actuating cylinder (20) is controlled by a fixed throttle (25) in the fluid feed line (23) and a throttle (26) in the fluid discharge line (24) which can be adjusted in proportion to the engine speed by electromagnetic means (27).

Description

Die vorliegende Erfindung betrifft eine Bypasssteuereinrichtung für turboaufgeladene Verbrennungsmotoren nach dem Oberbegriff des Patentanspruchs.The present invention relates to a bypass control device for turbocharged internal combustion engines according to the preamble of the claim.

Mit Bypasseinrichtungen lässt sich bekanntlich das Teillastverhalten turboaufgeladener Verbrennungsmotoren verbessern. Dabei wird ein vom jeweiligen Betriebszustand des Motors abhängiger Anteil der verdichteten Ladeluft über eine Bypassleitung an eine vor der Abgasturbine liegende Stelle der Abgasleitung zurückgeführt. Auf diese Weise erhält der Motor mehr Luft als bei Turboaufladung ohne Bypass. Zu diesem Zweck weist die Bypasseinrichtung ein Bypassventil auf, das durch irgendeine motorlastabhängige Grösse als Führungsgrösse gesteuert werden kann. Die Ventilerhebung verläuft dabei so, dass im Leerlauf- und im unteren Teillastbereich eine grosse und mit zunehmender Last eine immer weiter abnehmende Luftmenge überströmt, bis nahe der Vollast das Ventil ganz schliesst und das Ueberströmen von Bypassluft unterbunden wird.Bypass devices are known to improve the part-load behavior of turbocharged internal combustion engines. In this case, a portion of the compressed charge air which is dependent on the respective operating state of the engine is returned via a bypass line to a location of the exhaust line located in front of the exhaust gas turbine. In this way, the engine receives more air than with turbocharging without bypass. For this purpose, the bypass device has a bypass valve which can be controlled as a reference variable by means of a variable dependent on the engine load. The valve is raised in such a way that a large amount of air flows in the idling and lower part-load range and, with increasing load, an ever decreasing amount of air until the valve closes completely at full load and the overflow of bypass air is prevented.

Bei einer bekannten Bypasseinrichtung wird beispielsweise als Führungsgrösse zur Steuerung des Bypassluftstromes die über dem Bypass herrschende Druckdifferenz zwischen der verdichteten Ladeluft und dem Auspuff am Turbineneintritt verwendet.In a known bypass device, for example, as The control variable for controlling the bypass air flow uses the pressure difference prevailing over the bypass between the compressed charge air and the exhaust at the turbine inlet.

Es wurde auch schon vorgeschlagen, die Motordrehzahl als Führungsgrösse zu verwenden, doch ist, so weit bekannt, diese Idee bisher noch nicht verwirklicht worden.It has also been proposed to use engine speed as a guide, but as far as is known, this idea has not yet been realized.

Die im kennzeichnenden Teil des Patentanspruchs 1 definierte Erfindung entstand aus der Aufgabenstellung, eine Bypasssteuereinrichtung zu schaffen, bei der die Motordrehzahl als Führungsgrösse benutzt wird. Der Grund dafür war die vorzugsweise für Fahrzeugmotoren geplante Verwendung dieser Einrichtung, wofür sich die Motordrehzahl als Führungsgrösse besonders gut eignet.The invention defined in the characterizing part of patent claim 1 arose from the task of creating a bypass control device in which the engine speed is used as a command variable. The reason for this was the use of this device, which is preferably planned for vehicle engines, for which the engine speed is particularly well suited as a reference variable.

Die Erfindung wird im folgenden unter Bezugnahme auf das in der Zeichnung dargestellte Ausführungsbeispiel näher beschrieben. In der Zeichnung stellen dar:

  • Fig. 1 einen Turboladermotor mit einer Bypasseinrichtung und
  • Fig. 2 die dafür vorgesehene erfindungsgemässe Bypasssteuereinrichtung.
The invention is described below with reference to the embodiment shown in the drawing. In the drawing:
  • Fig. 1 shows a turbocharger engine with a bypass device and
  • 2 the bypass control device according to the invention provided for this purpose.

Der in Fig. 1 schematisch dargestellte Sechszylinderturboladermotor 1 weist einen Abgassammler 2 und einen Ladeluftaufnehmer 3 auf. Die Abgase gelangen über ein Abgasrohr 4 in die Abgasturbine 6 des Turboladers 5 und verlassen sie durch ein Auspuffrohr 8. Die Abgasturbine 6 ist durch eine Welle 7 mit dem Verdichter 9 verbunden, der durch eine Ansaugleitung 10 Luft ansaugt und sie verdichtet über eine Ladeluftleitung 11 durch das Bypasssteuergehäuse 12 in einen Ladeluftkühler 13 und weiter in den Ladeluftaufnehmer 3 drückt, aus dem die Zylinder ihre Verbrennungsluft erhalten. Die Bypassleitung 14 verbindet das Bypasssteuergehäuse 12 mit einer Stelle des Abgasrohres vor dem Eintritt in die Turbine 6. Zur Bypasseinrichtung gehört ferner ein vom Schwungrad 15 antreibbarer elektrischer Drehzahlgeber mit Verstärker 16, der Strom zur Drehzahlanzeige und zur Betätigung eines Proportionalmagneten liefert, sowie eine Signalleitung 17 zwischen dem Drehzahlgeber 16 und dem Steuergehäuse 12.The six-cylinder turbocharger engine 1 shown schematically in FIG. 1 has an exhaust manifold 2 and a charge air receiver 3. The exhaust gases enter and leave the exhaust gas turbine 6 of the turbocharger 5 via an exhaust pipe 4 through an exhaust pipe 8. The exhaust gas turbine 6 is connected by a shaft 7 to the compressor 9, which sucks in air through an intake line 10 and compresses it via a charge air line 11 through the bypass control housing 12 into a charge air cooler 13 and further into the charge air receiver 3 where the cylinders get their combustion air. The bypass line 14 connects the bypass control housing 12 to a point of the exhaust pipe before entering the turbine 6. The bypass device also includes an electric speed sensor which can be driven by the flywheel 15 and an amplifier 16 which supplies current for indicating the speed and for actuating a proportional magnet, as well as a signal line 17 between the speed sensor 16 and the control housing 12.

Die Bypasssteuereinrichtung ist in Fig. 2 schematisch dargestellt. Das Steuergehäuse 12 steht über eine Ventilöffnung 18 mit der Ladeluftleitung 11 und über die Bypassleitung 14 mit dem Abgasrohr 4 in Verbindung. Das mit der Ventilöffnung 18 zusammenwirkende Bypassventil 19 ist als Tellerventil ausgebildet, das am oberen Ende seines Ventilschaftes einen in einem Betätigungszylinder 20 verschiebbaren, durch eine Druckfeder 21 belasteten Kolben 22 aufweist.The bypass control device is shown schematically in FIG. 2. The control housing 12 is connected to the charge air line 11 via a valve opening 18 and to the exhaust pipe 4 via the bypass line 14. The bypass valve 19 cooperating with the valve opening 18 is designed as a poppet valve which has at the upper end of its valve stem a piston 22 which is displaceable in an actuating cylinder 20 and is loaded by a compression spring 21.

Die Einrichtung benutzt als Arbeitsmittel für die Steuerung ein Fluid unter etwa konstantem Druck, wie z.B. Luft aus einem Druckluftnetz, Oel aus einem Hydraulikaggregat oder auch aus dem Schmierölkreislauf des Motors. Die Zuleitung und die Ableitung des Arbeitsmittels sind in den beiden Figuren mit 23 bzw. 24 bezeichnet.The device uses a fluid under approximately constant pressure, e.g. Air from a compressed air network, oil from a hydraulic unit or from the engine's lubricating oil circuit. The supply line and the discharge line of the working medium are designated 23 and 24 in the two figures.

Im Abschnitt der Arbeitsmittelleitung zwischen Zuleitung 23 und Ableitung/befinden sich ein für einen bestimmten Motor fest einstellbares Drosselventil 25, das den maximalen Massenstrom des Arbeitsmittels durch das Ventil begrenzt, sowie ein Steuerdrosselventil 26, das drehzahlabhängig den Strömungsquerschnitt durch seinen Sitz und damit den Arbeitsmitteldruck zwischen den beiden Drosseln 25 und damit über dem Kolben 22 des Betätigungszylinders 20 steuert. Durch entsprechende Einstellung des Drosselventils 25 lassen sich der für einen gegebenen Motor erforderliche Druck im Betätigungszylinder 20 und damit die Stellkräfte für die Betätigung des Bypassventils 19 einstellen.In the section of the working medium line between the supply line 23 and the discharge line / there is a throttle valve 25 which can be fixed for a specific engine and which limits the maximum mass flow of the working medium through the valve, as well as a control throttle valve 26 which, depending on the speed, controls the flow cross section through its seat and thus the working medium pressure between controls the two throttles 25 and thus over the piston 22 of the actuating cylinder 20. The pressure in the actuating cylinder 20 required for a given motor and thus the actuating forces for actuating the bypass valve 19 can be adjusted by appropriate adjustment of the throttle valve 25.

Die drehzahlabhängige Betätigung des Steuerdrosselventils 26 erfolgt durch den Proportionalmagneten 27, dessen mit dem Ventil 26 starr verbundener Anker mit zunehmender Stärke des durch die Signalleitung 17 vom Signalgeber 16 her übertragenen Signals gegen den Widerstand einer Druckfeder 28 weiter in den Stator hineingezogen wird, bis es nahe der Höchstleistungsdrehzahl des Motors den Drosselquerschnitt ganz schliesst. Damit wird die Stellkraft auf den Kolben 22 ein Maximum, somit das Bypassventil 19 ganz geschlossen, das Ueberströmen von verdichteter Ladeluft gänzlich unterbunden.The speed-dependent actuation of the control throttle valve 26 is carried out by the proportional magnet 27, the armature rigidly connected to the valve 26 with increasing strength of the signal transmitted through the signal line 17 from the signal generator 16 against the resistance of a compression spring 28 is pulled further into the stator until it is close the maximum output speed of the engine completely closes the throttle cross-section. The actuating force on the piston 22 is thus at a maximum, and thus the bypass valve 19 is completely closed, and the overflow of compressed charge air is completely prevented.

Das vom Signalgeber 16 erzeugte Ausgangssignal wird vom Verstärker in eine drehzahlproportionale Spannung umgewandelt, die vom Proportionalmagneten 27 in die gewünschte drehzahlabhängige Verstellung des Steuerdrosselventils 26 sowie des Bypassventils 19 und damit des Bypassstromes umgesetzt wird.The output signal generated by the signal generator 16 is converted by the amplifier into a speed-proportional voltage, which is converted by the proportional magnet 27 into the desired speed-dependent adjustment of the control throttle valve 26 and the bypass valve 19 and thus the bypass flow.

Um eine Rezirkulation der Abgase in der Startphase und bei kleiner Leistung zu vermeiden, kann der Verstärker des Signalgebers durch ein Element erweitert werden, das dafür sorgt, dass das Bypassventil im untersten Drehzahlbereich geschlossen bleibt.To recirculate the exhaust gases in the start-up phase and at To avoid low power, the signal transmitter amplifier can be expanded with an element that ensures that the bypass valve remains closed in the lowest speed range.

In die Steuerung könnte auch ein Mikroprozessor integriert werden, mit dem sich eine beliebige, von der Motordrehzahl eindeutig abhängige Ventilerhebungskurve verwirklichen lässt.A microprocessor could also be integrated into the control, with which any valve lift curve that is clearly dependent on the engine speed can be implemented.

B e z e i c h n u n g s l i s t eB e z e i c h n u n g s l i s t e

  • 1 Sechszylinderturboladermotor1 six-cylinder turbocharger engine
  • 2 Abgassammler2 exhaust gas collectors
  • 3 Ladeluftaufnehmer3 charge air sensors
  • 4 Abgasrohr4 exhaust pipe
  • 5 Turbolader5 turbochargers
  • 6 Abgasturbine6 exhaust gas turbine
  • 7 Welle7 wave
  • 8 Auspuffrohr8 exhaust pipe
  • 9 Verdichter9 compressors
  • 10 Ansaugleitung10 suction line
  • 11 Ladeluftleitung11 Charge air line
  • 12 Bypasssteuergehäuse12 bypass control housing
  • 13 Ladeluftkühler13 intercooler
  • 14 Bypassleitung14 bypass line
  • 15 Schwungrad15 flywheel
  • 16 Elektrischer Signalgeber mit Verstärker16 Electrical signal transmitter with amplifier
  • 17 Signalleitung17 signal line
  • 18 Ventilöffnung18 valve opening
  • 19 Bypassventil19 bypass valve
  • 20 Betätigungszylinder20 actuating cylinders
  • 21 Druckfeder21 compression spring
  • 22 Kolben22 pistons
  • 23 Zuleitung des Arbeitsmittels23 Supply of work equipment
  • 24 Ableitung des Arbeitsmittels24 Deriving the work equipment
  • 25 Einstellbares Drosselventil25 Adjustable throttle valve
  • 26 Steuerdrosselventil26 Control throttle valve
  • 27 Proportionalmagnet27 Proportional magnet
  • 28 Druckfeder28 compression spring

Claims (1)

1.1.
EP80200488A 1979-07-11 1980-05-23 Bypass control device for turbo-supercharged internal-combustion engines Expired EP0022585B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6464/79 1979-07-11
CH646479 1979-07-11

Publications (2)

Publication Number Publication Date
EP0022585A1 true EP0022585A1 (en) 1981-01-21
EP0022585B1 EP0022585B1 (en) 1983-11-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200488A Expired EP0022585B1 (en) 1979-07-11 1980-05-23 Bypass control device for turbo-supercharged internal-combustion engines

Country Status (5)

Country Link
US (1) US4378677A (en)
EP (1) EP0022585B1 (en)
JP (1) JPS5618029A (en)
DE (2) DE2932081A1 (en)
DK (1) DK293980A (en)

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US3163984A (en) * 1962-11-13 1965-01-05 Lincoln B Dumont Supercharged internal combustion engine arrangement
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Publication number Publication date
DE2932081A1 (en) 1981-01-29
EP0022585B1 (en) 1983-11-02
US4378677A (en) 1983-04-05
JPS5618029A (en) 1981-02-20
DE3065447D1 (en) 1983-12-08
DK293980A (en) 1981-01-12

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